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                                        &nbsp; &nbsp; （1）物理层：计算机或交换机网线未插、网线接触不良、网线损坏；<br>
                                        &nbsp; &nbsp; （2）数据链路层：交换机电源故障、交换机端口故障、计算机网卡故障；<br>
                                        &nbsp; &nbsp; （3）网络层：IP地址错误、子网掩码错误、网关错误、vlan配置错误、NAT配置错误；<br>
                                        &nbsp; &nbsp;  （4）传输层：防火墙配置错误；<br>
                                        &nbsp; &nbsp;  （5）应用层：DNS配置错误；<br>
                                       
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